\begin{thebibliography}{2}

\bibitem{bel66} Belady, L.A. 
A study of replacement algorithms for virtual storage computers,
\textit{IBM Syst.J.5,2 (1966)}

\bibitem{eff84} Effelssberg \& Haerder.
Principles of Database Buffer Management, 
\textit{ACM TODS, Vol.9.Iss.4 (1984)}
 
\end{thebibliography}
